How will it affect my site SEO, if I get backlink from a hign spam score percentage site like 70 % .
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**Above how much percentage of spam score should I avoid getting backlinks. **
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All I know about this is that Google HATES spam and they have a new(ish) system - read about it here - whereby the distance between authority websites is measured in a sort of distributed way using lots of servers and loads of stuff too hard for my brain to fathom. It's worth a read though because he puts it into simple language too.
The upshot is that your site can now be better ranked if it is 'closer' to an authority site using this system. Now I would bet you a million pounds that this works positively (so I get a link from a small but authoritative site and will get a bump in my rankings) but it also works negatively - to reduce webspam.
So - and I'm totally hypothesising here - I'd say getting yourself links from high spam sites will get you labelled as a spam site too. And this is not a crazy jump of the imagination when you look at the work google has done getting rid of PBN's and groups of sites circle-jerking (sorry can't think of a better word here) themselves to the top of the rankings.
So I'd stay as far away from spam as you can. Even if the other stats are good stats. GOOGLE HATES SPAM and they are going to rid the entire web of it one day. So you're possibly polishing the brass on the Titanic with these links.
But test it. I would worry that I might get labelled permanently in that spammy place though. It's not like you can disavow and just have everything return to normal the next day. I think it's a very dangerous game.
Why don't you go after nice less spammy high authority and good sites for links? That's just as hard or easy as getting the nasty ones on side surely?
But I'm not an expert here so if some good spam-experienced people could chime in that would be good.
Out of interest what's the site. You can email it or DM it to me if it's private. I'll run it through Ahrefs, Rush, and a few more I have and see what they say.
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Have a look at how Moz now calculates the spam score, it is done based on correlation with characteristics of other band websites.
That is to say just because it's a high spam score doesn't mean to say it's going to do you damage.
However I always steer completely clear of any indication of spam.
I would consider 20% plenty high enough, at 40% I would completely avoid it and put my effort elsewhere.